Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 747 · 40 questions

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

1. 1.48 × 18 =
2. 2.28 × 24 =
3. 3.48 × 24 =
4. 4.18 × 14 =
5. 5.38 × 16 =
6. 6.47 × 12 =
7. 7.22 × 12 =
8. 8.45 × 18 =
9. 9.31 × 14 =
10. 10.49 × 15 =
11. 11.25 × 14 =
12. 12.49 × 14 =
13. 13.20 × 15 =
14. 14.34 × 18 =
15. 15.19 × 24 =
16. 16.27 × 15 =
17. 17.12 × 15 =
18. 18.30 × 16 =
19. 19.19 × 14 =
20. 20.16 × 15 =
21. 21.20 × 24 =
22. 22.23 × 12 =
23. 23.25 × 15 =
24. 24.26 × 15 =
25. 25.14 × 16 =
26. 26.32 × 14 =
27. 27.33 × 14 =
28. 28.31 × 16 =
29. 29.13 × 15 =
30. 30.46 × 16 =
31. 31.21 × 16 =
32. 32.11 × 16 =
33. 33.24 × 14 =
34. 34.40 × 12 =
35. 35.19 × 18 =
36. 36.14 × 15 =
37. 37.14 × 12 =
38. 38.34 × 12 =
39. 39.43 × 18 =
40. 40.46 × 14 =

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